chip separation effects

[P3D Bob Aldridge <bob.aldridge@xxxxxx>]

Paul Talbot quotes and then comments:

->Author/editor/professor George A. Themelis, in explaining the
->stereo window, writes:
-> 
->> The stereo window is controlled by changing the borders of the
->>images.<snip> > In slides where a fixed mask is used (as in Realist
->>slides) bringing > the chips closer together 
->>pulls the window towards the observer.                               
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
->> Pulling the chips apart pushes the window further back. 

->I find this part of the (otherwise very useful) discussion very
->confusing, due to the part I marked.

Well, Prof T (promotion? :-) :-) ) is right for projection of the images
PROVIDED that the projector is adjusted for infinity points separated on
the screen by 2.5 inches (approx). However, if the frames are simply
superimposed, then the window will remain at the screen distance...

In a viewer, you could, I suppose, alter the inter-occular. I suspect
the effect would be different, however.

Bob Aldridge
Stereoscopic Society Projectionist
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 * POW 2.0  0007 * E Pluribus Modem


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